AMEGHINO: LES FORMATIOXS SEDIMEXTAIEES. 



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Modiola Scli3'thei, 1(31, 503, 515. 



Modiola tulipa, 246. 



Moeritherium, 336-338, 341. 



Moeritherium Lj-onsi, 334. 



Molossus. 492. 



Monophora, 169, 170. 



Monophora Darwini, 169, 170, 255-257, 



•265, 266. .501, 502. 

 Morenella, 481. 

 Morphippus, 471, 475. 

 Mucronella, 190. 

 Mucronella Grotriani, 192. 

 Muscardinas, 243. 

 Myliobatis, 183. 

 Myliobatis Pentoni, 183. 



Myocastor, 241, 409, 415, 484-486, 488-491. 



Myochlamys, 512. 



Myopotamus, 409. 



Myopotamus sansaniensis, 410. 



Myopterus, 492. 



Myoxus. 243, 244. 



Mytilus, 245, 274, 276. 



Mytilus aff. domingensis. 279. 



Mytilus aff. trigonus, 256. 



Mytilus decipiens; 56. 



Mytilus edulis var. patagónica, 249, 274. 



Mytilus magellanicus, 249, 266, 279. 



Mytilus ovalis, 279. 



Mytilus subcylindricus, 515. 



Nacella aff. fuegensis, 279, 517. 



Nacella magellanica, 279. 



Nacella pygmaea, 514. 



Xassa polygona, 499. 



Natica ceneria. 56. 



Xatica chiloénsis, 155. 



Natica Darwini, 134. 



Xatica microstoma, 123, 505. 



Xautilus, 52. 



Nautilus Carolo-Ameghinoi, 505. 



Nautilus Ronieroi, 50. 



Nautilus Yalenciennei, 50, 52, 508. 



Necrodasypus, 378, 879, 452, 453, 455-460, 



517. 

 Xecrodasypus Galliae, 379, 881, 454, 456. 

 Necrolestes, 389-391, 479. 

 Xecrolestes patagonensis, 390, 503. 

 Necromanis, 376. 

 Xecromanis Quercyi, 375. 

 Necromys, 412, 500. 

 Xeilo, 57. 

 Xeilo ornata, 504. 

 Xemolestes, 390. 



Xemolestes spalacotherinus, 391. 

 Xeobalaena, 492. 

 Xeoepiblema, 481. 

 Xeoinoceramus, 102, 127. 

 Xeoinoceramus Ameghinoi, 104,126,505. 

 Xeomylodon, 492, 499. 

 Neonematherium, 483, 501. 

 Xeonematherium flabellatum, 268. 

 Xeoplagiaulax, 284, 361. 

 Xeoracanthus, 487, 488, 500. 

 Xeoreomys, 226, 241, 410, 476, 478. 

 Xeoreoniys australis, 408. 

 Xeothoracophorus, 487, 488. 



Xephacodus, 295, 467, 507. 



Xephacodus latigonus, 295. 



Xephotherium, 482, 485. 



Xesocerodon, 418. 



Nesodon, 214, 215, 475, 476, 478, 480, 503. 



Xesodon (couches a), 23, 25, 201, 214, 216. 



Xesodon andium, 504. 



Nesodon cavifrons, 504. 



Xesodon imbricatus, 503. 



Xesodon imbricatus ( couches a, ), 25, 



135, 201, 213, 214, 232. 

 Xesodon impinguatus, 505. 

 Xesobippidion, 487, 499. 

 Nesohippus, 469. 

 Nesokerodon, 244. 

 Neuryurus. 482, 484, 485, 487, 500. 

 Xictypithecus, 432. 

 Xoctilio, 492. 

 Xopachtus, 485, 486. 

 Xopachtus coagmentatus, 500. 

 Xotamynus, 470. 

 Xothropus, 488. 

 Nothrotherium, 488. 

 Xotictis, 482. 

 Xotidanus, 18(5. 

 Xotidanus atrox, 70. 

 Xotidanus Muensteri, 70, 183. 

 Xotidanus siccus, 183. 

 Xotidanus ultra, 183. 

 Notiomj's, 491. 

 Notohippus, 476. 

 Xotohippus (couches á), 201, 205, 206, 



208-211, 213, 214. 

 Xotohippus (faune du), 209, 212, 214. 

 Xotohippus toxodontoides, 504. 

 Xotohvrax. 471. 



